Vitamin B3 (Niacin) in the Paleo Diet

An expert at aiding your body to convert carbohydrates into energy, Vitamin B3 or Niacin plays an important role in the metabolic functions. Good digestive function, detoxification processes, and the creation of hormones – all of these have to say a word of thanks to Niacin as well.

But how do you know if you’re missing this important vitamin in your paleo diet? Niacin deficiency can be characterised by digestive problems, skin infections, lack of appetite, and generalised weakness or muscular weakness. In addition, you might be prone to Niacin deficiency if you’ve suffered from stress, physical trauma, long-term fever, and excessive consumption of alcohol.

It’s quite impressive how Vitamin B3 can benefit your body in adequate amounts. Just look at this list of medical conditions that it may help to prevent or treat – Alzheimer’s, depression, diabetes, gout, hallucinations, headaches, hyperactivity, hypothyroidism, insomnia, inflammatory bowel disease, menstrual pains, multiple sclerosis, osteoarthritis, rheumatoid arthritis, pellagra, smelling and taste disorders, vertigo. Let’s focus on Alzheimer’s for a moment – in a research from 2004 it was found that elderly subjects who consumed most Niacin in their food were 70% less likely to have Alzheimer’s than those who consumed the least. What an illustration for the power of food in achieving good health until old age. This is what makes the Paleo Diet so fantastic – it shows that delicious whole foods can be the best medicine for your body.

How much Vitamin B3 should you consume?

The recommended daily amount is 20mg, and there are no toxicity symptoms reported to be connected to Niacin consumption from whole foods. However, a tolerable upper limit from supplements is set at 35mg.

Which foods can you get Niacin from?

Now, your body can produce some Vitamin B3 from an amino acid called tryptophan, but this is really inefficient. The Paleo Diet is a great source for adequate Niacin consumption, since it includes a variety of natural food sources. Here are some of the best!

1. Liver – If you’re looking for a “comprehensive health supplement”, liver is one of the best, and Vitamin B3 is no exception here. A portion of 100g of lamb liver will provide you with 83% of your daily Niacin need, with other animal livers providing just slightly less than that.
2. Chicken – Lean meats are a great source of Niacin, with chicken at the top of the list. A serving of 100g provides you with 68.6% of your daily need.
3. Tuna – A protein-rich portion of tuna is another good source for Vitamin B3, as a 100g portion covers 15.7% of your daily intake need. Tuna salad, anyone?
4. Turkey – Another lean meat, turkey provides 37% of your daily need of Vitamin B3 in a serving size of 100g. If you’re used to preparing a lot of chicken, try turkey on some of the nights instead for a slightly different micronutrient profile.
5. Venison – Yes, Vitamin B3 seems to be all about lean meats… Venison provides you with 37.1% of your daily Niacin need in a 100g portion. Might be time to ring up that hunter you know!
6. Halibut – This fish that makes for a lovely dinner along with some veggies provides 35.6% of your daily Niacin need in 100g.
7. Shiitake mushrooms – These mushrooms that provide a rich taste for any dish cover 19.4% of your daily Niacin need in a 100g portion. That’s a good enough reason to search for some Asian recipes for your next dinner!
8. Sweet potatoes – Not just a source of carbs to fuel your activity, sweet potatoes also provide some great nutrition. One cup of baked sweet potatoes will cover 8.5% of your daily need of Vitamin B3, so feel free to add them to your preferred piece of meat or fish.

What else should you know about Vitamin B3 consumption?

One of the most stable water-soluble vitamins, Niacin is only minimally influenced by air, light, and heat, and thus you shouldn’t be worried about losing the vitamin B3 content of the food you are cooking or storing.

So, what do you think? Are you planning a meaty (or fishy) Niacin-rich dinner already? Share your thoughts about this vitamin in the comments!

Niacin and Cardiovascular Health

Vitamin B3 plays a particularly noteworthy role in supporting cardiovascular health. Research has shown that niacin can help increase HDL (the “good” cholesterol) and lower LDL (the “bad” cholesterol), as well as triglycerides. This makes it especially important for those aiming to reduce their risk of heart disease through dietary changes.

While most clinical studies have used high doses of niacin supplements to achieve these effects, the emphasis in the Paleo world is on prevention through whole food nutrition. By regularly incorporating niacin-rich animal proteins and whole food fats, you support your heart naturally – without relying on pharmaceutical interventions.

In fact, some practitioners of ancestral health believe that Vitamin B3 was one of the unsung heroes of traditional diets that kept historical populations heart-healthy long before statins were invented.

Vitamin B3 and Detoxification Pathways

Niacin is also essential for the body’s natural detoxification pathways, particularly in the liver. It helps produce NAD (nicotinamide adenine dinucleotide), a critical coenzyme involved in phase I and phase II liver detoxification. These processes are how your body breaks down toxins, hormones, and waste products – all vital in maintaining homeostasis.

Supporting these pathways naturally, via niacin-rich foods, can help reduce the toxic burden on the liver and enhance your overall resilience. This is particularly relevant in the modern world where exposure to endocrine disruptors, pesticides, and pollutants is difficult to avoid.

If you’ve been feeling sluggish, foggy-headed, or just “off,” your detox pathways may be under strain – and ensuring adequate B3 intake could be part of the solution.

Niacin’s Role in Brain and Cognitive Function

Niacin’s role in neurological health is another area of growing interest. Alongside its involvement in energy production and circulation, niacin contributes to the repair of DNA and nerve cell signalling. Several studies suggest that insufficient niacin levels may contribute to cognitive decline, memory loss, and mood disorders like anxiety and depression.

While B vitamins often work synergistically, niacin is particularly beneficial in maintaining brain function and supporting neuroplasticity – the brain's ability to adapt and form new neural connections. This is a crucial function for everyone, especially as we age.

A nutrient-dense Paleo diet that includes organ meats, seafood, nuts, and root vegetables gives your brain the raw materials it needs to function optimally – without needing to rely on nootropics or synthetic supplements.

Signs You Might Be Getting Too Little Niacin

Beyond the classic signs of deficiency mentioned earlier (fatigue, digestive issues, skin inflammation), here are some other subtle symptoms that may point to a suboptimal intake of Vitamin B3:

• Difficulty concentrating or persistent brain fog
• Increased sensitivity to sunlight
• Low mood or depressive symptoms
• Dry or cracked skin, particularly on hands and lips
• Tingling or burning sensation in the feet

If you’re eating a variety of whole Paleo foods, especially those from animal sources, it’s unlikely that you’ll be truly deficient. However, those who follow a low-meat or overly restricted Paleo approach, or are recovering from digestive issues, may want to monitor their intake more closely.

Can You Get Too Much Niacin?

As noted earlier, niacin from whole foods is safe – and no upper limit has been set for naturally occurring B3 in food. However, high-dose niacin supplements (especially the “flush” versions) can cause unpleasant side effects like skin flushing, dizziness, or nausea in some people.

If you’re considering niacin supplements for specific health reasons (such as cholesterol management), always consult a qualified practitioner. For most people, meeting needs through diet is not only safer but more sustainable.

Paleo Tips for Boosting Your B3 Naturally

Looking to boost your Vitamin B3 intake without supplements? Here are some simple Paleo-friendly strategies:

• Rotate your meats: Don’t rely on just chicken or beef. Include turkey, lamb, venison, and wild-caught fish for variety and a broader micronutrient profile.
• Embrace organ meats: Liver is a true superfood. If you’re not a fan of the flavour, try blending it into patties or making a smooth pâté.
• Include mushrooms regularly: Shiitake and cremini mushrooms are great in stir-fries, stews, or oven-roasted with garlic and olive oil.
• Serve B3 with healthy fats: Fat-soluble vitamins and fat-rich meals enhance the bioavailability of many nutrients, including those in B-vitamin–dense meats.

In Summary

Vitamin B3 (Niacin) may not get as much attention as Vitamin D or Magnesium in the mainstream nutrition world, but it’s absolutely essential for maintaining energy, hormone production, detoxification, mental clarity, and long-term health. Fortunately, following a varied Paleo diet that includes lean proteins, organ meats, seafood, and colourful vegetables makes it easy to get enough – naturally.

So next time you’re planning your weekly meals, why not make it a goal to include one or two high-niacin dishes? Your metabolism, mind, and mitochondria will thank you.

🥩 Have you noticed a difference in your energy or mood when eating more organ meats or high-B3 foods? Share your story in the comments – I’d love to hear how real food is supporting your real health journey.